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For the current week, the overall ratings of five Internet and Web Service stocks are worse, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

21Vianet Group’s (NASDAQ:VNET) rating weakens this week, dropping to a D versus last week’s C. 21Vianet Group provides carrier-neutral Internet data center services in the Peoples Republic of China. The stock gets F’s in Earnings Growth and Earnings Momentum. For a full analysis of VNET stock, visit Portfolio Grader.

This week, iPass (NASDAQ:IPAS) drops from a C to a D rating. iPass offers enterprise mobility services on a global basis by providing services that simply, smartly and openly facilitate network access from mobile devices while providing the enterprise with visibility and control over their mobile ecosystem. The stock gets F’s in Earnings Revisions, Equity, and Sales Growth. The stock price has dropped 10.4% over the past month, worse than the 3.3% increase the Nasdaq has seen over the same period of time. To get an in-depth look at IPAS, get Portfolio Grader’s complete analysis of IPAS stock.

This is a rough week for Liquidity Services (NASDAQ:LQDT). The company’s rating falls to D from the previous week’s C. Liquidity Services provides full service solutions to market and sell surplus assets and wholesale goods. The stock also rates an F in Earnings Momentum. As of May 10, 2013, 24% of outstanding Liquidity Services shares were held short. The trailing PE Ratio for the stock is 28.90. For more information, get Portfolio Grader’s complete analysis of LQDT stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.